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yt-wall-detection.preload.js
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yt-wall-detection.preload.js
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*
* @param {function} createItem
* A function which will be called in order to create the value for any
* key which does not exist, the first time it is accessed. The
* function receives, as its only argument, the key being created.
*/
class DefaultWeakMap extends WeakMap {
constructor(createItem, items = undefined) {
super(items);
this.createItem = createItem;
}
get(key) {
if (!this.has(key)) {
this.set(key, this.createItem(key));
}
return super.get(key);
}
}
/**
* Returns true if the given object is an object with a `then` method, and can
* therefore be assumed to behave as a Promise.
*
* @param {*} value The value to test.
* @returns {boolean} True if the value is thenable.
*/
const isThenable = value => {
return value && typeof value === "object" && typeof value.then === "function";
};
/**
* Creates and returns a function which, when called, will resolve or reject
* the given promise based on how it is called:
*
* - If, when called, `chrome.runtime.lastError` contains a non-null object,
* the promise is rejected with that value.
* - If the function is called with exactly one argument, the promise is
* resolved to that value.
* - Otherwise, the promise is resolved to an array containing all of the
* function's arguments.
*
* @param {object} promise
* An object containing the resolution and rejection functions of a
* promise.
* @param {function} promise.resolve
* The promise's resolution function.
* @param {function} promise.reject
* The promise's rejection function.
* @param {object} metadata
* Metadata about the wrapped method which has created the callback.
* @param {boolean} metadata.singleCallbackArg
* Whether or not the promise is resolved with only the first
* argument of the callback, alternatively an array of all the
* callback arguments is resolved. By default, if the callback
* function is invoked with only a single argument, that will be
* resolved to the promise, while all arguments will be resolved as
* an array if multiple are given.
*
* @returns {function}
* The generated callback function.
*/
const makeCallback = (promise, metadata) => {
return (...callbackArgs) => {
if (extensionAPIs.runtime.lastError) {
promise.reject(new Error(extensionAPIs.runtime.lastError.message));
} else if (metadata.singleCallbackArg || callbackArgs.length <= 1 && metadata.singleCallbackArg !== false) {
promise.resolve(callbackArgs[0]);
} else {
promise.resolve(callbackArgs);
}
};
};
const pluralizeArguments = numArgs => numArgs == 1 ? "argument" : "arguments";
/**
* Creates a wrapper function for a method with the given name and metadata.
*
* @param {string} name
* The name of the method which is being wrapped.
* @param {object} metadata
* Metadata about the method being wrapped.
* @param {integer} metadata.minArgs
* The minimum number of arguments which must be passed to the
* function. If called with fewer than this number of arguments, the
* wrapper will raise an exception.
* @param {integer} metadata.maxArgs
* The maximum number of arguments which may be passed to the
* function. If called with more than this number of arguments, the
* wrapper will raise an exception.
* @param {boolean} metadata.singleCallbackArg
* Whether or not the promise is resolved with only the first
* argument of the callback, alternatively an array of all the
* callback arguments is resolved. By default, if the callback
* function is invoked with only a single argument, that will be
* resolved to the promise, while all arguments will be resolved as
* an array if multiple are given.
*
* @returns {function(object, ...*)}
* The generated wrapper function.
*/
const wrapAsyncFunction = (name, metadata) => {
return function asyncFunctionWrapper(target, ...args) {
if (args.length < metadata.minArgs) {
throw new Error(`Expected at least ${metadata.minArgs} ${pluralizeArguments(metadata.minArgs)} for ${name}(), got ${args.length}`);
}
if (args.length > metadata.maxArgs) {
throw new Error(`Expected at most ${metadata.maxArgs} ${pluralizeArguments(metadata.maxArgs)} for ${name}(), got ${args.length}`);
}
return new Promise((resolve, reject) => {
if (metadata.fallbackToNoCallback) {
// This API method has currently no callback on Chrome, but it return a promise on Firefox,
// and so the polyfill will try to call it with a callback first, and it will fallback
// to not passing the callback if the first call fails.
try {
target[name](...args, makeCallback({
resolve,
reject
}, metadata));
} catch (cbError) {
console.warn(`${name} API method doesn't seem to support the callback parameter, ` + "falling back to call it without a callback: ", cbError);
target[name](...args); // Update the API method metadata, so that the next API calls will not try to
// use the unsupported callback anymore.
metadata.fallbackToNoCallback = false;
metadata.noCallback = true;
resolve();
}
} else if (metadata.noCallback) {
target[name](...args);
resolve();
} else {
target[name](...args, makeCallback({
resolve,
reject
}, metadata));
}
});
};
};
/**
* Wraps an existing method of the target object, so that calls to it are
* intercepted by the given wrapper function. The wrapper function receives,
* as its first argument, the original `target` object, followed by each of
* the arguments passed to the original method.
*
* @param {object} target
* The original target object that the wrapped method belongs to.
* @param {function} method
* The method being wrapped. This is used as the target of the Proxy
* object which is created to wrap the method.
* @param {function} wrapper
* The wrapper function which is called in place of a direct invocation
* of the wrapped method.
*
* @returns {Proxy<function>}
* A Proxy object for the given method, which invokes the given wrapper
* method in its place.
*/
const wrapMethod = (target, method, wrapper) => {
return new Proxy(method, {
apply(targetMethod, thisObj, args) {
return wrapper.call(thisObj, target, ...args);
}
});
};
let hasOwnProperty = Function.call.bind(Object.prototype.hasOwnProperty);
/**
* Wraps an object in a Proxy which intercepts and wraps certain methods
* based on the given `wrappers` and `metadata` objects.
*
* @param {object} target
* The target object to wrap.
*
* @param {object} [wrappers = {}]
* An object tree containing wrapper functions for special cases. Any
* function present in this object tree is called in place of the
* method in the same location in the `target` object tree. These
* wrapper methods are invoked as described in {@see wrapMethod}.
*
* @param {object} [metadata = {}]
* An object tree containing metadata used to automatically generate
* Promise-based wrapper functions for asynchronous. Any function in
* the `target` object tree which has a corresponding metadata object
* in the same location in the `metadata` tree is replaced with an
* automatically-generated wrapper function, as described in
* {@see wrapAsyncFunction}
*
* @returns {Proxy<object>}
*/
const wrapObject = (target, wrappers = {}, metadata = {}) => {
let cache = Object.create(null);
let handlers = {
has(proxyTarget, prop) {
return prop in target || prop in cache;
},
get(proxyTarget, prop, receiver) {
if (prop in cache) {
return cache[prop];
}
if (!(prop in target)) {
return undefined;
}
let value = target[prop];
if (typeof value === "function") {
// This is a method on the underlying object. Check if we need to do
// any wrapping.
if (typeof wrappers[prop] === "function") {
// We have a special-case wrapper for this method.
value = wrapMethod(target, target[prop], wrappers[prop]);
} else if (hasOwnProperty(metadata, prop)) {
// This is an async method that we have metadata for. Create a
// Promise wrapper for it.
let wrapper = wrapAsyncFunction(prop, metadata[prop]);
value = wrapMethod(target, target[prop], wrapper);
} else {
// This is a method that we don't know or care about. Return the
// original method, bound to the underlying object.
value = value.bind(target);
}
} else if (typeof value === "object" && value !== null && (hasOwnProperty(wrappers, prop) || hasOwnProperty(metadata, prop))) {
// This is an object that we need to do some wrapping for the children
// of. Create a sub-object wrapper for it with the appropriate child
// metadata.
value = wrapObject(value, wrappers[prop], metadata[prop]);
} else if (hasOwnProperty(metadata, "*")) {
// Wrap all properties in * namespace.
value = wrapObject(value, wrappers[prop], metadata["*"]);
} else {
// We don't need to do any wrapping for this property,
// so just forward all access to the underlying object.
Object.defineProperty(cache, prop, {
configurable: true,
enumerable: true,
get() {
return target[prop];
},
set(value) {
target[prop] = value;
}
});
return value;
}
cache[prop] = value;
return value;
},
set(proxyTarget, prop, value, receiver) {
if (prop in cache) {
cache[prop] = value;
} else {
target[prop] = value;
}
return true;
},
defineProperty(proxyTarget, prop, desc) {
return Reflect.defineProperty(cache, prop, desc);
},